We're not gone. We've just moved.
Trivia Templates are now fully integrated into the Actions on Google Console. We've streamlined the process to make it even easier.
If you've been using triviatemplate.com to create trivia apps, use the same Actions Console project as before and don't create a new one. You will need to re-select your persona and update your data.
Find out more about the various action templates to create Google Assistant apps without writing any code. Go ahead, check it out.